Cranberry is a traditional American herbal supplement used for the prevention of urinary tract infection.
The recommended dosing for UTI prophylaxis is based on the most recent positive randomized controlled trial that used one tablet of concentrated cranberry extract (300 to 400 mg) twice daily, or 8 oz of pure unsweetened cranberry juice three times daily.
Cranberry appears to be a safe, herbal choice for UTI prevention and has relatively good tolerability. The most recent studies have found that the use of cranberry for up to 12 months is safe and moderately effective. More evidence is necessary to recommend its use for clinical indications other than UTI prophylaxis. Care should be taken when recommending cranberry for long-term use in patients who are known urinary oxalate stone formers. No significant herb-drug reactions with cranberry have been reported.



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